U.S. patent number 10,746,182 [Application Number 15/314,377] was granted by the patent office on 2020-08-18 for multi-stage compressor system, control device, malfunction determination method, and program.
This patent grant is currently assigned to MITSUBISHI HEAVY INDUSTRIES COMPRESSOR CORPORATION. The grantee listed for this patent is MITSUBISHI HEAVY INDUSTRIES COMPRESSOR CORPORATION. Invention is credited to Hiroyuki Miyata, Naoki Mori, Yosuke Nakagawa, Naoto Yonemura.
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United States Patent |
10,746,182 |
Nakagawa , et al. |
August 18, 2020 |
Multi-stage compressor system, control device, malfunction
determination method, and program
Abstract
A multi-stage compressor system is a system of a multi-stage
compressor in which compressors are connected in series in a
plurality of stages includes a control unit. The control unit
determines whether a malfunction is present in the system by
comparing a suction flow rate of a first-stage compressor measured
by a first sensor with a downstream flow rate from an outlet of the
multi-stage compressor measured by a second sensor.
Inventors: |
Nakagawa; Yosuke (Tokyo,
JP), Yonemura; Naoto (Hiroshima, JP),
Miyata; Hiroyuki (Hiroshima, JP), Mori; Naoki
(Hiroshima, JP) |
Applicant: |
Name |
City |
State |
Country |
Type |
MITSUBISHI HEAVY INDUSTRIES COMPRESSOR CORPORATION |
Minato-ku |
N/A |
JP |
|
|
Assignee: |
MITSUBISHI HEAVY INDUSTRIES
COMPRESSOR CORPORATION (Tokyo, JP)
|
Family
ID: |
55019109 |
Appl.
No.: |
15/314,377 |
Filed: |
June 22, 2015 |
PCT
Filed: |
June 22, 2015 |
PCT No.: |
PCT/JP2015/067896 |
371(c)(1),(2),(4) Date: |
November 28, 2016 |
PCT
Pub. No.: |
WO2016/002565 |
PCT
Pub. Date: |
January 07, 2016 |
Prior Publication Data
|
|
|
|
Document
Identifier |
Publication Date |
|
US 20170198704 A1 |
Jul 13, 2017 |
|
Foreign Application Priority Data
|
|
|
|
|
Jul 1, 2014 [JP] |
|
|
2014-136051 |
|
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F04B
49/10 (20130101); F04D 19/007 (20130101); F04D
27/001 (20130101); F04D 19/02 (20130101); F04D
17/12 (20130101); F04D 25/163 (20130101) |
Current International
Class: |
F04D
27/00 (20060101); F04D 25/16 (20060101); F04B
49/10 (20060101); F04D 19/00 (20060101); F04D
17/12 (20060101); F04D 19/02 (20060101) |
Field of
Search: |
;417/251-253 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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101387306 |
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Mar 2009 |
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CN |
|
102027348 |
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Apr 2011 |
|
CN |
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102378888 |
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Mar 2012 |
|
CN |
|
102008021102 |
|
Oct 2009 |
|
DE |
|
0769624 |
|
Apr 1997 |
|
EP |
|
2 268 228 |
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GB |
|
55-123393 |
|
Sep 1980 |
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JP |
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57-153237 |
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Sep 1982 |
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JP |
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62-48999 |
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Mar 1987 |
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JP |
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63-235697 |
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Sep 1988 |
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JP |
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2007-232259 |
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Sep 2007 |
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JP |
|
2013-143136 |
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Jul 2013 |
|
JP |
|
2013-170573 |
|
Sep 2013 |
|
JP |
|
2014-92138 |
|
May 2014 |
|
JP |
|
2014-109264 |
|
Jun 2014 |
|
JP |
|
10-1204900 |
|
Nov 2012 |
|
KR |
|
1765533 |
|
Sep 1992 |
|
SU |
|
Other References
Written Opinion of the International Searching Authority and the
International Search Report (Forms PCT/ISA/210 and PCT/ISA/237),
dated Sep. 29, 2015, for International Application No.
PCT/JP2015/067896, with an English translation. cited by applicant
.
Chinese Office Action and Search Report for Chinese Application No.
201580027311.X, dated Sep. 4, 2017, with an English translation of
the Chinese Office Action. cited by applicant.
|
Primary Examiner: Freay; Charles G
Attorney, Agent or Firm: Birch, Stewart, Kolasch &
Birch, LLP
Claims
What is claimed is:
1. A system of a multi-stage compressor in which compressors are
connected in series in a plurality of stages, the multi-stage
compressor system comprising: a control unit configured to
determine whether a malfunction is present in the system by
comparing a suction flow rate of a first-stage compressor measured
by a first sensor with a downstream flow rate from an outlet of the
multi-stage compressor measured by a second sensor, and a blowoff
valve disposed at a downstream side of the multi-stage compressor,
wherein the control unit determines that the malfunction is present
when a measurement value of the first sensor and a measurement
value of the second sensor are not the same within a predetermined
error range, and the control unit is configured to open the blowoff
valve in a case that the malfunction is present.
2. The multi-stage compressor system according to claim 1, wherein
the multi-stage compressor includes a pair of first-stage
compressors and subsequent-stage compressors, wherein the
subsequent-stage compressors serially connected to the first-stage
compressors compress fluids compressed by the pair of first-stage
compressors.
3. The multi-stage compressor system according to claim 2, wherein
a measurement value of each of the first sensor and the second
sensor is corrected according to at least one of a temperature of a
fluid, a pressure of the fluid, and a molecular weight of the fluid
in which the first sensor and the second sensor measure.
4. The multi-stage compressor system according to claim 1, wherein
a measurement value of each of the first sensor and the second
sensor is corrected according to at least one of a temperature of a
fluid, a pressure of the fluid, and a molecular weight of the fluid
in which the first sensor and the second sensor measure.
5. The multi-stage compressor system according to claim 4, wherein
a pressure of a fluid is measured at an upstream side of the first
sensor and a temperature of the fluid is measured at a downstream
side of the first sensor.
6. A control device for a multi-stage compressor in which
compressors are connected in series in a plurality of stages, the
control device comprising: a control unit configured to determine
whether a malfunction is present in the system by comparing a
suction flow rate of a first-stage compressor measured by a first
sensor with a downstream flow rate from an outlet of the
multi-stage compressor measured by a second sensor and determining
that the malfunction is present when a measurement value of the
first sensor and a measurement value of the second sensor are not
the same within a predetermined error range, and the control unit
is configured to open a blowoff valve which is disposed at a
downstream side of the multi-stage compressor in a case that the
malfunction is present.
7. The control device according to claim 6, wherein a measurement
value of each of the first sensor and the second sensor is
corrected according to at least one of a measured temperature of a
fluid, a measured pressure of the fluid, and a measured molecular
weight of the fluid around the sensor.
8. A malfunction determination method for use in a system of a
multi-stage compressor in which compressors are connected in series
in a plurality of stages, the malfunction determination method
comprising: determining, by a control unit, whether a malfunction
is present in the system by comparing a suction flow rate of a
first-stage compressor measured by a first sensor with a downstream
flow rate from an outlet of the multi-stage compressor measured by
a second sensor, and determining that the malfunction is present
when a measurement value of the first sensor and a measurement
value of the second sensor are not the same within a predetermined
error range, and opening a blowoff valve which is disposed at a
downstream side of the multi-stage compressor in a case that the
malfunction is present.
9. The malfunction determination method according to claim 8,
wherein the multi-stage compressor includes a pair of first-stage
compressors and sub sequent-stage compressors, wherein the
subsequent-stage compressors serially connected to the first-stage
compressors compress fluids compressed by the pair of first-stage
compressors.
10. The malfunction determination method according to claim 8,
wherein a measurement value of each of the first sensor and the
second sensor is corrected according to at least one of a
temperature of a fluid, a pressure of the fluid, and a molecular
weight of the fluid in which the first sensor and the second sensor
measure.
11. The malfunction determination method according to claim 10,
wherein a pressure of a fluid is measured at an upstream side of
the first sensor and a temperature of the fluid is measured at a
downstream side of the first sensor.
12. A non-transitory computer readable medium storing a program
configured to cause a computer of a control device for controlling
a multi-stage compressor in which compressors are connected in
series in a plurality of stages to function as: a control means
configured to determine whether a malfunction is present in the
system by comparing a suction flow rate of a first-stage compressor
measured by a first sensor with a downstream flow rate from an
outlet of the multi-stage compressor measured by a second sensor,
and the control means being configured to determine that the
malfunction is present when a measurement value of the first sensor
and a measurement value of the second sensor are not the same
within a predetermined error range, and the control means being
configured to open a blowoff valve which is disposed at a
downstream side of the multi-stage compressor in a case that the
malfunction is present.
13. The non-transitory computer readable medium storing the program
according to claim 12, wherein the program causes the computer to
function as: a means configured to correct a measurement value of
each of the first sensor and the second sensor according to at
least one of a measured temperature of a fluid, a measured pressure
of the fluid, and a measured molecular weight of the fluid around
the sensor.
Description
TECHNICAL FIELD
The present invention relates to a multi-stage compressor system, a
control device, a malfunction determination method, and a
program.
Priority is claimed on Japanese Patent Application No. 2014-136051,
filed Jul. 1, 2014, the content of which is incorporated herein by
reference.
BACKGROUND ART
A compressor which compresses gases and supplies the compressed
gases to machines or the like connected to a downstream side of a
gas system is known. As this compressor, there is a compressor in
which a gas flow rate for a compressor body is adjusted by
arranging an inlet guide vane (IGV) at an upstream side and
adjusting the degree of opening of the IGV.
In Patent Document 1, technology of appropriately controlling a
degree of opening of the IGV and performing an optimum operation
even when a performance difference occurs between two first-stage
compressor bodies among a plurality of compressor bodies is
disclosed as related technology.
CITATION LIST
Patent Document
[Patent Document 1]
Japanese Unexamined Patent Application, First Publication No.
2013-170573
SUMMARY OF INVENTION
Technical Problem
By the way, in a multi-stage compressor as disclosed in Patent
Document 1 when a flow rate meter provided in a first compressor is
in an abnormal state and a result of measuring a gas flow rate
higher than an actual gas flow rate is shown, an operation is
performed at a low gas flow rate by correcting flow rate deviation
on the basis of a result of erroneously measuring the gas flow
rate. Thus, it is likely to be in a surge state. In this case,
because the flow rate meter is in the abnormal state, anti-surge
control for preventing the surge state using the flow rate meter is
also likely not to be normally operated.
In addition, when a phenomenon in which an amount of leakage of a
gas is increased by the breakdown or the like of the seal part
occurs in the multi-stage compressor as disclosed in Patent
Document 1, the leakage of the gas is unlikely to be detected.
Also, a method based on redundancy or the like is considered to
detect a malfunction of a measuring instrument such as a flow rate
meter. However, when the method based on redundancy is used, the
cost is likely to increase.
Thus, technology capable of detecting a malfunction in the
multi-stage compressor system without making a measuring instrument
redundant is required.
The present invention provides a multi-stage compressor system, a
control device, a malfunction determination method, and a program
capable of solving the above-described problem.
Solution to Problem
According to a first aspect of the present invention, a multi-stage
compressor system is a system of a multi-stage compressor in which
compressors are connected in series in a plurality of stages, the
multi-stage compressor system including: a control unit configured
to determine whether a malfunction is present in the system by
comparing a suction flow rate of a first-stage compressor measured
by a first sensor with a downstream flow rate from an outlet of the
multi-stage compressor measured by a second sensor.
According to a second aspect of the present invention, in the
multi-stage compressor system, the multi-stage compressor includes
a pair of first-stage compressors and subsequent-stage compressors,
wherein the subsequent-stage compressors serially connected to the
first-stage compressors compress fluids compressed by the pair of
first-stage compressors.
According to a third aspect of the present invention, in the
multi-stage compressor system, a measurement value of each of the
first sensor and the second sensor is corrected according to at
least one of a temperature of a fluid, a pressure of the fluid, and
a molecular weight of the fluid in which the first sensor and the
second sensor measure.
According to a fourth aspect of the present invention, in the
multi-stage compressor system, a third sensor configured to measure
an amount of drainage downstream generated from a compressed fluid
from an outlet of the first-stage compressor is provided, and
measurement values of the first sensor and the second sensor are
corrected according to the amount of drainage measured by the third
sensor.
According to a fifth aspect of the present invention, in the
multi-stage compressor system, a pressure of a fluid is measured at
an upstream side of the first sensor and a temperature of the fluid
is measured at a downstream side of the first sensor.
According to a sixth aspect of the present invention, a control
device is a control device for a multi-stage compressor in which
compressors are connected in series in a plurality of stages, the
control device including: a control unit configured to determine
whether a malfunction is present in the system by comparing a
suction flow rate of a first-stage compressor measured by a first
sensor with a downstream flow rate from an outlet of the
multi-stage compressor measured by a second sensor.
According to a seventh aspect of the present invention, in the
control device, the multi-stage compressor includes a pair of
first-stage compressors and subsequent-stage compressors, wherein
the subsequent-stage compressors serially connected to the
first-stage compressors compress fluids compressed by the pair of
first-stage compressors.
According to an eighth aspect of the present invention, in the
control device, a measurement value of each of the first sensor and
the second sensor is corrected according to at least one of a
measured temperature of a fluid, a measured pressure of the fluid,
and a measured molecular weight of the fluid around the sensor.
According to a ninth aspect of the present invention, in the
control device, a third sensor configured to measure an amount of
drainage downstream generated from a compressed fluid from an
outlet of the first-stage compressor is provided, and measurement
values of the first sensor and the second sensor are corrected
according to the amount of drainage measured by the third
sensor.
According to a tenth aspect of the present invention, in the
control device, a pressure of a fluid is measured at an upstream
side of the first sensor and a temperature of the fluid is measured
at a downstream side of the first sensor.
According to an eleventh aspect of the present invention, a
malfunction determination method is a malfunction determination
method for use in a system of a multi-stage compressor in which
compressors are connected in series in a plurality of stages, the
malfunction determination method including: determining, by a
control unit, whether a malfunction is present in the system by
comparing a suction flow rate of a first-stage compressor measured
by a first sensor with a downstream flow rate from an outlet of the
multi-stage compressor measured by a second sensor.
According to a twelfth aspect of the present invention, in the
malfunction determination method, the multi-stage compressor
includes a pair of first-stage compressors and subsequent-stage
compressors, wherein the subsequent-stage compressors serially
connected to the first-stage compressors compress fluids compressed
by the pair of first-stage compressors.
According to a thirteenth aspect of the present invention, in the
malfunction determination method, a measurement value of each of
the first sensor and the second sensor is corrected according to at
least one of a temperature of a fluid, a pressure of the fluid, and
a molecular weight of the fluid in which the first sensor and the
second sensor measure.
According to a fourteenth aspect of the present invention, in the
malfunction determination method, a third sensor configured to
measure an amount of drainage downstream generated from a
compressed fluid from an outlet of the first-stage compressor is
provided, and measurement values of the first sensor and the second
sensor are corrected according to the amount of drainage measured
by the third sensor.
According to a fifteenth aspect of the present invention, in the
malfunction determination method, a pressure of a fluid is measured
at an upstream side of the first sensor and the temperature of the
fluid is measured at a downstream side of the first sensor.
According to a sixteenth aspect of the present invention, a program
is a program configured to cause a computer of a control device for
controlling a multi-stage compressor in which compressors are
connected in series in a plurality of stages to function as: a
control means configured to determine whether a malfunction is
present in the system by comparing a suction flow rate of a
first-stage compressor measured by a first sensor with a downstream
flow rate from an outlet of the multi-stage compressor measured by
a second sensor.
According to a seventeenth aspect of the present invention, the
program causes the computer to function as: a means configured to
correct a measurement value of each of the first sensor and the
second sensor according to at least one of a measured temperature
of a fluid, a measured pressure of the fluid, and a measured
molecular weight of the fluid around the sensor.
According to an eighteenth aspect of the present invention, the
program causes the computer to function as: a means configured to
correct measurement values of the first sensor and the second
sensor according to the amount of drainage measured by a third
sensor configured to measure an amount of drainage downstream
generated from a compressed fluid from an outlet of the first-stage
compressor.
Advantageous Effects of Invention
According to the multi-stage compression system, the control
device, the malfunction determination method, and the program
described above, it is possible to detect a malfunction in a
multi-stage compressor system without making a measuring instrument
redundant.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a diagram showing an example of a configuration of a
multi-stage compressor system according to a first embodiment of
the present invention.
FIG. 2 is a diagram showing an example of a configuration of a
multi-stage compressor system according to a second embodiment of
the present invention.
FIG. 3 is a diagram showing an example of a configuration of a
compressor control device in the present embodiment.
FIG. 4 is a diagram showing an example of a configuration of a
multi-stage compressor system according to a third embodiment of
the present invention.
FIG. 5 is a diagram showing an example of a configuration of a
multi-stage compressor system according to a fourth embodiment of
the present invention.
DESCRIPTION OF EMBODIMENTS
First Embodiment
FIG. 1 is a diagram showing an example of a configuration of a
multi-stage compressor system 1 according to the first embodiment
of the present invention.
As shown in FIG. 1, the multi-stage compressor system 1 according
to the first embodiment includes a multi-stage compressor 10, a
first sensor 20a, a second sensor 20b, a control unit 30, and a
notification unit 40.
The multi-stage compressor 10 includes a first-stage compressor
body 101, a last-stage compressor body 102, and a second-stage
compressor body 103.
The first-stage compressor body 101 is a first-stage compressor
body of the multi-stage compressor 10. The first-stage compressor
body 101 takes in a gas and generates a compressed gas.
The last-stage compressor body 102 is a compressor body of a last
stage of the multi-stage compressor 10. The last-stage compressor
body 102 takes in a gas compressed in a previous stage and
generates a compressed gas.
The second-stage compressor body 103 is connected to the
first-stage compressor body 101 in series. The second-stage
compressor body 103 takes in the gas compressed by the first-stage
compressor body 101. The second-stage compressor body 103
compresses the taken in gas and discharges the compressed gas to a
third-stage compressor body of a subsequent stage connected in
series. Likewise, a compressor body of a stage subsequent to the
third-stage compressor body is connected in series. Also, each
compressor body of a stage subsequent to the third-stage compressor
body similarly takes in a compressed gas, compresses the taken in
gas, and outputs the compressed gas to a subsequent-stage
compressor body.
The first sensor 20a measures a flow rate of a gas taken in by the
first-stage compressor body 101.
The second sensor 20b measures a flow rate of a gas discharged by
the last-stage compressor body 102.
The control unit 30 compares a gas flow rate measured by the first
sensor 20a with a gas flow rate measured by the second sensor 20b
and determines whether two measurement values are the same within a
predetermined error range.
When it is determined that the two measurement values are the same
within the predetermined error range, the control unit 30
determines that the multi-stage compressor system 1 is normal.
Also, when it is determined that the two measurement values are not
the same within the predetermined error range, the control unit 30
determines that a malfunction is occurring in the multi-stage
compressor system 1.
Also, when the multi-stage compressor system 1 is normal, this
determination is based on the fact that all the gas taken in by the
first-stage compressor body 101 is discharged by passing through
the second-stage compressor body 103, the subsequent-stage
compressor body, and the last-stage compressor body 102. When a
measurement value of a flow rate of a gas taken in by the
first-stage compressor body 101 is different from a measurement
value of a flow rate of a gas discharged by passing through the
second- and subsequent-stage compressor bodies including the
last-stage compressor body 102, a malfunction of the measuring
instrument is first considered. When no malfunction is found in the
measuring instrument, the gas between the first-stage compressor
body 101 and the second- and subsequent-stage compressor bodies is
likely to have been leaked. When the gas is leaked between the
first-stage compressor body 101 and the second- and
subsequent-stage compressor bodies, there is a possibility of a
breakdown of a seal part of the compressor.
When a flow rate measurement result from the first sensor 20a and a
flow rate measurement result from the second sensor 20b are
different, the control unit 30 notifies the user that some
malfunction might be occurring in the multi-stage compressor system
1 via the notification unit 40. For example, the notification unit
40 is a display, a speaker, a vibration device, or the like. The
notification unit 40 may display "Please confirm whether the
measuring device is normal." or "Gas is likely leaking." or provide
a notification by sound. Also, the notification unit 40 may cause
the malfunction of the multi-stage compressor system 1 to be known
by vibration.
Also, the control unit 30 may stop flow rate deviation correction
when it is determined that a malfunction is likely to have occurred
in the multi-stage compressor system 1. Also, the control unit 30
may control a blowoff valve 108 to be opened to a fixed degree of
opening in order to prevent a surge operation. In addition, the
control unit 30 may stop the system.
As described above, in the multi-stage compressor system 1, the
control unit 30 compares the flow rates of gases taken in by the
first-stage compressor body 101, which is measured by the first
sensor 20a, with the flow rate of a gas discharged by the
last-stage compressor body 102, which is measured by the second
sensor 20b. When the flow rates of gases taken in by the
first-stage compressor body 101, which is measured by the first
sensor 20a, are different from the flow rate of a gas discharged by
the last-stage compressor body 102, which is measured by the second
sensor 20b, the control unit 30 determines that there is a
possibility of a sensor malfunction or gas leakage in the
multi-stage compressor system 1. The control unit 30 notifies the
user of a possibility of some occurring malfunction in the
multi-stage compressor system 1 via the notification unit 40.
Thus, the multi-stage compressor system 1 can detect a malfunction
in the multi-stage compressor system 1 without making the measuring
instrument redundant.
Second Embodiment
FIG. 2 is a diagram showing an example of a configuration of a
multi-stage compressor system 1a according to the second embodiment
of the present invention.
The multi-stage compressor system 1a according to the second
embodiment includes a multi-stage compressor 10a and a compressor
control device 200a (a control device).
The multi-stage compressor 10a includes first-stage compressor
bodies 101 (101a and 101b) arranged in series from an upstream side
of a flow of a gas to a downstream side, a second-stage compressor
body 103, and a last-stage compressor body 102. The first-stage
compressor body 101 is formed of a pair including the first-stage
compressor body 101a and the first-stage compressor body 101b.
The first-stage compressor bodies 101 (101a and 101b), the
second-stage compressor body 103, and the last-stage compressor
body 102 are coupled via a shaft 106. The first-stage compressor
bodies 101a and 101b are arranged to form a pair in parallel on the
upstream side of the shaft 106. On the downstream side of the shaft
106, the second-stage compressor body 103 and the last-stage
compressor body 102 are arranged in parallel. A motor 104 is
connected to a middle portion of the shaft 106. Each compressor
body and the motor 104 are connected to the shaft 106 via a gearbox
105.
Supply lines 130a and 130b are pipes for supplying gases to the
first-stage compressor bodies 101a and 101b. The supply line 130a
is connected to an inlet of the first-stage compressor body 101a.
Also, the supply line 130b is connected to an inlet of the
first-stage compressor body 101b. The first-stage compressor body
101a generates a compressed gas by taking in the gas via the supply
line 130a and compressing the gas. The first-stage compressor body
101b generates a compressed gas by taking in the gas via the supply
line 130b and compressing the gas.
A first connection line 132 is a pipe for supplying the compressed
gas generated by the first-stage compressor bodies 101a and 101b to
the second-stage compressor body 103. The first connection line 132
is connected to an outlet of the first-stage compressor body 101a
and an outlet of the first-stage compressor body 101b. Also, the
first connection line 132 is connected to an inlet of the
second-stage compressor body 103. The first connection line 132
includes a merging portion and the compressed gases discharged by
the two first-stage compressor bodies 101a and 101b are merged in
the merging portion. The first connection line 132 supplies the
merged compressed gases to the second-stage compressor body
103.
The second-stage compressor body 103 generates a compressed gas by
further compressing the compressed gas taken in via the first
connection line 132. A second connection line 133 is a pipe for
supplying the compressed gas generated by the second-stage
compressor body 103 to the last-stage compressor body 102. The
second connection line 133 is connected to an outlet of the
second-stage compressor body 103 and an inlet of the last-stage
compressor body 102. The second connection line 133 supplies the
compressed gas to the last-stage compressor body 102.
The last-stage compressor body 102 generates a compressed gas by
further compressing the compressed gas taken in via the second
connection line 133. A discharge line 131 is a pipe for supplying
the compressed gas generated by the last-stage compressor body 102
to a downstream process. The discharge line 131 is connected to an
outlet of the last-stage compressor body 102 and an inlet of the
downstream process. The discharge line 131 supplies the compressed
gas to the downstream process.
An inlet guide vane (hereinafter, IGV) 107a is provided in the
supply line 130a around the inlet of the first-stage compressor
body 101a. An IGV 107b is provided in the supply line 130b around
the inlet of the first-stage compressor body 101b. The IGV 107a
provided in the supply line 130a controls a flow rate of the gas
flowing into the first-stage compressor body 101a. The IGV 107b
provided in the supply line 130b controls the flow rate of the gas
flowing into the first-stage compressor body 101b.
The discharge line 131 around an outlet of the last-stage
compressor body 102 is provided with the blowoff valve 108. When
the compressor is a compressor in which the gas to be compressed is
air, the blowoff valve 108 provided in the discharge line 131
discharges air into the atmosphere via a blowoff line 136. Also,
when the gas is nitrogen or the like, a recycle valve can be used.
In this case, the blowoff valve 108 can return the gas to the
supply line 130a via a recycle line by which the blowoff line 136
is connected to the supply line 130a. Also, the blowoff valve 108
can return the gas to the supply line 130b via the recycle line in
which the blowoff line 136 is connected to the supply line
130a.
Because the IGV 107a, the IGV 107b, and the blowoff valve 108
control the outlet pressure of the compressor or avoid surging, its
degree of opening is controlled.
An inlet flow rate determination unit 114a is arranged at the
supply line 130a. The inlet flow rate determination unit 114a
determines the inlet gas flow rate of a gas flowing into the
first-stage compressor body 101a and generates an inlet flow rate
determination value. An inlet flow rate determination unit 114b is
arranged at the supply line 130b. The inlet flow rate determination
unit 114b determines an inlet gas flow rate of a gas flowing into
the first-stage compressor body 101b and generates an inlet flow
rate determination value.
A post-merger pressure determination unit 110 is arranged in the
downstream side of the merging portion of the first connection line
132. The post-merger pressure determination unit 110 generates a
post-merger pressure determination value by determining a pressure
after the merging of the gases flowing out of the first-stage
compressor bodies 101a and 101b. A cooler 109a is arranged at the
first connection line 132. The cooler 109a cools the gas flowing
inside the first connection line 132.
A cooler 109b is arranged at the second connection line 133. The
cooler 109b cools the gas flowing inside the second connection line
133.
An outlet pressure determination unit 111 is arranged at the
discharge line 131. The outlet pressure determination unit 111
generates an outlet pressure determination value by determining the
pressure of the gas flowing out of the last-stage compressor body
102. Also, an outlet flow rate determination unit 115 is arranged
at the discharge line 131. The outlet flow rate determination unit
115 generates an outlet flow rate determination value by
determining the flow rate of the gas flowing out of the last-stage
compressor body 102.
Next, a configuration of the compressor control device 200a in the
second embodiment of the present invention will be described.
FIG. 3 is a diagram showing an example of the configuration of the
compressor control device 200a in the second embodiment of the
present invention.
The compressor control device 200a in the second embodiment of the
present invention includes a control unit 30a, a notification unit
40, IGV opening degree control units 50 (50a and 50b), and a
blowoff valve opening degree control unit 53.
The IGV opening degree control unit 50a controls a degree of
opening of the IGV 107a. The IGV opening degree control unit 50b
controls a degree of opening of the IGV 107b. Configurations of the
IGV opening degree control unit 50a and the IGV opening degree
control unit 50b are identical.
The IGV opening degree control unit 50a includes an IGV opening
degree command value generation unit 51 and an IGV opening degree
command value correction unit 52a. The IGV opening degree control
unit 50b includes an IGV opening degree command value generation
unit 51 and an IGV opening degree command value correction unit
52b. The IGV opening degree command value generation unit 51 is
common between the IGV opening degree control unit 50a and the IGV
opening degree control unit 50b.
The IGV opening degree command value generation unit 51 generates
and outputs an IGV opening degree command value indicating a degree
of opening of the IGV 107a. The IGV opening degree command value
generation unit 51 generates and outputs an IGV opening degree
command value indicating a degree of opening of the IGV 107b. The
IGV opening degree command value generation unit 51 includes a
pressure controller 129 and a function generator 116.
The IGV opening degree command value correction units 52a and 52b
correct an IGV opening degree command value output by the IGV
opening degree command value generation unit 51.
The IGV opening degree command value correction unit 52a includes a
flow rate indicator 125a which outputs an input inlet flow rate
determination value as it is, a pressure indicator 126 which
outputs an input post-merger pressure determination value as it is,
and a function generator 117a which outputs an IGV opening degree
correction value.
The IGV opening degree command value correction unit 52b includes a
flow rate indicator 125b which outputs an input inlet flow rate
determination value as it is, the pressure indicator 126 which
outputs an input post-merger pressure determination value as it is,
and a function generator 117b which outputs an IGV opening degree
correction value.
The pressure indicator 126 is common between the IGV opening degree
command value correction units 52a and 52b, but the present
invention is not limited thereto.
The blowoff valve opening degree control unit 53 controls a degree
of opening of the blowoff valve 108. The blowoff valve opening
degree control unit 53 includes upstream-side anti-surge control
units 54 (54a and 54b), an outlet pressure control unit 55, a
downstream-side anti-surge control unit 56, and a command value
selection unit 112.
Here, anti-surge control is control for maintaining a flow rate at
a fixed value or more in order to prevent the compressor from being
damaged by so-called surging caused by a decrease in the flow rate
in the compressor.
The upstream-side anti-surge control unit 54a controls a degree of
opening of the blowoff valve 108 in order to prevent surging from
occurring in the first-stage compressor body 101a. The
upstream-side anti-surge control unit 54b controls a degree of
opening of the blowoff valve 108 in order to prevent surging from
occurring in the first-stage compressor body 101b. Here,
configurations of the upstream-side anti-surge control unit 54a and
the upstream-side anti-surge control unit 54b are identical.
The upstream-side anti-surge control unit 54a includes a pressure
indicator 126 which outputs an input post-merger outlet pressure
determination value as it is, a function generator 118a which
outputs an inlet flow rate target value, a flow rate indicator 125a
which outputs an input inlet flow rate determination value as it
is, and a flow rate controller 127a which outputs a blowoff valve
opening degree command value on the basis of an inlet flow rate
target value. The upstream-side anti-surge control unit 54b
includes the pressure indicator 126 which outputs an input
post-merger outlet pressure determination value as it is, a
function generator 118b which outputs an inlet flow rate target
value, a flow rate indicator 125b which outputs an input inlet flow
rate determination value as it is, and a flow rate controller 127b
which outputs a blowoff valve opening degree command value on the
basis of an inlet flow rate target value.
Also, although the pressure indicator 126 is common between the
upstream-side anti-surge control unit 54a and the upstream-side
anti-surge control unit 54b, the present invention is not limited
thereto.
The outlet pressure control unit 55 includes a pressure controller
129 which outputs an operation value for setting the input outlet
pressure determination value to a setting value and a function
generator 119 which outputs a blowoff valve opening degree command
value.
The downstream-side anti-surge control unit 56 includes a function
generator 120 which outputs an outlet flow rate target value and a
flow rate controller 128 which outputs a blowoff valve opening
degree command value on the basis of the outlet flow rate target
value.
Also, the IGV opening degree command value correction unit 52a
includes a performance difference correction coefficient generation
unit 124, an inlet flow rate target value generation unit 122, and
a function generator 121a. The IGV opening degree command value
correction unit 52b includes the performance difference correction
coefficient generation unit 124, the inlet flow rate target value
generation unit 122, and a function generator 121b.
The performance difference correction coefficient generation unit
124 and the inlet flow rate target value generation unit 122 are
common between the IGV opening degree command value correction unit
52a and the IGV opening degree command value correction unit 52b.
The performance difference correction coefficient generation unit
124 generates and outputs a performance difference correction
coefficient for correcting a performance difference between the two
first-stage compressor bodies 101a and 101b. The performance
difference correction coefficient and the inlet flow rate
determination values in the first-stage compressor bodies 101a and
101b are input to the inlet flow rate target value generation unit
122 and inlet flow rate target values are generated for the
first-stage compressor bodies 101a and 101b.
The inlet flow rate target values are input to the corresponding
function generators 121a and 121b. The function generator 121a is
provided in correspondence with a command value selection unit
113a. The function generator 121b is provided in correspondence
with a command value selection unit 113b.
The inlet flow rate target value and the inlet flow rate
determination value output from the corresponding flow rate
indicator 125a are input to the function generator 121a. The inlet
flow rate target value and the inlet flow rate determination value
output from the corresponding flow rate indicator 125b are input to
the function generator 121b. Function generators 121 (121a and
121b) generate and output IGV opening degree command correction
values in proportion to a difference between the inlet flow rate
target value and the inlet flow rate determination value. Here the
function generators 121 (121a and 121b) may consider the
integration of the difference between the inlet flow rate target
value and the inlet flow rate determination value and generate and
output the IGV opening degree command correction value.
The control unit 30a inputs an inlet flow rate determination value
corresponding to the inlet flow rate determination unit 114a from
the flow rate indicator 125a, an inlet flow rate determination
value corresponding to the inlet flow rate determination unit 114b
from the flow rate indicator 125b, and an output flow rate
determination value of the outlet flow rate determination unit 115.
The control unit 30a determines whether a malfunction is present in
the multi-stage compressor system 1a on the basis of the inlet flow
rate determination values and the output flow rate determination
value.
Next, operations of the control unit 30a and the notification unit
40 provided in the compressor control device 200a according to the
second embodiment will be described.
The control unit 30a inputs the inlet flow rate determination value
corresponding to the inlet flow rate determination unit 114a from
the flow rate indicator 125a, the inlet flow rate determination
value corresponding to the inlet flow rate determination unit 114b
from the flow rate indicator 125b, and an output flow rate
determination value of the outlet flow rate determination unit 115.
The control unit 30a designates the inlet flow rate determination
value input from the flow rate indicator 125a as FI11. The control
unit 30a designates the inlet flow rate determination value input
from the flow rate indicator 125b as FI12. The control unit 30a
designates the output flow rate determination value input from the
outlet flow rate determination unit 115 as FC3. The control unit
30a determines whether an absolute value of (FI11+FI12-FC3) is
greater than or equal to a predetermined reference value. This
reference value is a value determined in consideration of a flow
rate response delay or a gas leakage amount of a normal operation
time, a drain flow rate in a compressor intercooler, or the
like.
The control unit 30a determines that the multi-stage compressor
system 1a is normal when the absolute value of (FI11+FI12-FC3) is
less than the predetermined reference value.
Also, when the absolute value of (FI11+FI12-FC3) is greater than or
equal to the predetermined reference value, the control unit 30a
determines that a malfunction is occurring in the multi-stage
compressor system 1a. In this case, the control unit 30a notifies
the user that some malfunction is likely occurring in the
multi-stage compressor system 1a via the notification unit 40. For
example, the notification unit 40 is a display, a speaker, a
vibration device, or the like. The notification unit 40 may display
"Please confirm whether the measuring device is normal." or "Gas is
likely leaking." or provide a notification by sound. Also, the
notification unit 40 may cause the malfunction of the multi-stage
compressor system 1a to be known by vibration.
Also, the control unit 30a may stop flow rate deviation correction
when it is determined that a malfunction has likely occurred in the
multi-stage compressor system 1a. Also, the control unit 30a may
control the blowoff valve 108 to be opened to a fixed degree of
opening in order to prevent a surge operation. In addition, the
control unit 30a may stop the system.
As described above, in the multi-stage compressor system 1a, the
control unit 30a compares the flow rates of gases taken in by the
first-stage compressor bodies 101a and 101b, which are measured by
the inlet flow rate determination units 114a and 114b (the first
sensor), with the flow rate of a gas discharged by the last-stage
compressor body 102, which is measured by the outlet flow rate
determination unit 115 (the second sensor). When the flow rates of
gases taken in by the first-stage compressor bodies 101, which are
measured by the inlet flow rate determination units 114a and 114b,
are different from the flow rate of a gas discharged by the
last-stage compressor body 102, which is measured by the outlet
flow rate determination unit 115, the control unit 30a determines
that there is a possibility of a malfunction of the determination
unit or gas leakage in the multi-stage compressor system 1a. The
control unit 30a notifies the user of a possibility of some
occurring malfunction in the multi-stage compressor system 1a via
the notification unit 40.
Thus, the multi-stage compressor system 1a can detect a malfunction
in the multi-stage compressor system 1a without making the
measuring instrument redundant.
Third Embodiment
FIG. 4 is a diagram showing an example of a configuration of a
multi-stage compressor system 1b according to the third embodiment
of the present invention.
The multi-stage compressor system according to the third embodiment
1b includes a multi-stage compressor 10a and a compressor control
device 200b (a control device).
The multi-stage compressor system 1b according to the third
embodiment is a system in which inlet pressure determination units
134 (134a and 134b), inlet temperature determination units 135
(135a and 135b), pressure indicators 136a, 136b, and 136c, and
temperature indicators 137 (137a, 137b, and 137c), an outlet
pressure determination unit 138, an outlet temperature
determination unit 139, and a flow rate indicator 140 are added to
the multi-stage compressor system 1a according to the second
embodiment.
Here, a difference of the multi-stage compressor system 1b
according to the third embodiment from the multi-stage compressor
system 1a according to the second embodiment will be described.
The inlet pressure determination unit 134a generates an inlet
pressure determination value by determining the pressure of the gas
flowing into the first-stage compressor body 101a. The pressure
indicator 136a outputs an inlet pressure determination value input
from the inlet pressure determination unit 134a to the flow rate
indicator 125a.
The inlet temperature determination unit 135a generates an inlet
temperature determination value by determining the temperature of a
gas flowing into the first-stage compressor body 101a. The
temperature indicator 137a outputs the inlet temperature
determination value input from the inlet temperature determination
unit 135a to the flow rate indicator 125a.
The flow rate indicator 125a corrects a flow rate determination
value on the basis of the input inlet pressure determination value
and the input inlet temperature determination value.
The inlet pressure determination unit 134b generates an inlet
pressure determination value by determining the pressure of a gas
flowing into the first-stage compressor body 101b. The pressure
indicator 136b outputs the inlet pressure determination value input
from the inlet pressure determination unit 134b to the flow rate
indicator 125b.
The inlet temperature determination unit 135b generates an inlet
temperature determination value by determining the temperature of a
gas flowing into the first-stage compressor body 101b. The
temperature indicator 137b outputs the inlet temperature
determination value input from the inlet temperature determination
unit 135b to the flow rate indicator 125b.
The flow rate indicator 125b corrects a flow rate determination
value on the basis of the input inlet pressure determination value
and the input inlet temperature determination value.
The outlet pressure determination unit 138 generates an outlet
pressure determination value by determining the pressure of a gas
flowing out of the last-stage compressor body 102. The pressure
indicator 136c outputs an outlet pressure determination value
output from the outlet pressure determination unit 138 to the flow
rate indicator 140.
The outlet temperature determination unit 139 generates an outlet
temperature determination value by determining the temperature of
the gas flowing out of the last-stage compressor body 102. The
temperature indicator 137c outputs the outlet temperature
determination value output from the outlet temperature
determination unit 139 to the flow rate indicator 140.
The flow rate indicator 140 corrects a flow rate determination
value on the basis of the input outlet pressure determination value
and the input outlet temperature determination value.
The control unit 30b inputs an inlet flow rate determination value
corresponding to the inlet flow rate determination unit 114a from
the flow rate indicator 125a, an inlet flow rate determination
value corresponding to the inlet flow rate determination unit 114b
from the flow rate indicator 125b, and an outlet flow rate
determination value from the flow rate indicator 140. The control
unit 30b designates the inlet flow rate determination value input
from the flow rate indicator 125a as FI11c. The control unit 30b
designates the inlet flow rate determination value input from the
flow rate indicator 125b as FI12c. The control unit 30b designates
the output flow rate determination value input from the flow rate
indicator 140 as FC3c. The control unit 30b determines whether an
absolute value of (FI11c+FI12c-FC3c) is greater than or equal to a
predetermined reference value. This reference value is a value
determined in consideration of a flow rate response delay or a gas
leakage amount of a normal operation time, a drain flow rate in a
compressor intercooler, or the like.
The control unit 30b determines that the multi-stage compressor
system 1b is normal when the absolute value of (FI11c+FI12c-FC3c)
is less than the predetermined reference value.
Also, when the absolute value of (FI11c+FI12c-FC3c) is greater than
or equal to the predetermined reference value, the control unit 30b
determines that a malfunction is occurring in the multi-stage
compressor system 1b. In this case, the control unit 30b notifies
the user that some malfunction is likely occurring in the
multi-stage compressor system 1b via the notification unit 40. For
example, the notification unit 40 is a display, a speaker, a
vibration device, or the like. The notification unit 40 may display
"Please confirm whether the measuring device is normal." or "Gas is
likely leaking." or provide a notification by sound. Also, the
notification unit 40 may cause the malfunction of the multi-stage
compressor system 1b to be known by vibration.
Also, the control unit 30b may stop flow rate deviation correction
when it is determined that a malfunction is likely occurring in the
multi-stage compressor system 1b. Also, the control unit 30b may
control the blowoff valve 108 to be opened to a fixed degree of
opening in order to prevent a surge operation. In addition, the
control unit 30b may stop the system.
As described above, in the multi-stage compressor system 1b, the
control unit 30b compares the flow rates of gases taken in by the
first-stage compressor bodies 101a and 101b, which are measured by
the inlet flow rate determination units 114a and 114b (the first
sensor), with the flow rate of a gas discharged by the last-stage
compressor body 102, which is measured by the outlet flow rate
determination unit 115 (the second sensor). When the flow rates of
gases taken in by the first-stage compressor bodies 101, which are
measured by the inlet flow rate determination units 114a and 114b,
are different from the flow rate of a gas discharged by the
last-stage compressor body 102, which is measured by the outlet
flow rate determination unit 115, the control unit 30b determines
that there is a possibility of a malfunction of the determination
unit or gas leakage in the multi-stage compressor system 1b. The
control unit 30b notifies the user of a possibility of some
occurring malfunction in the multi-stage compressor system 1b via
the notification unit 40.
Thus, the multi-stage compressor system 1b can detect a malfunction
in the multi-stage compressor system 1b without making the
measuring instrument redundant.
Also, as described above, in the multi-stage compressor system 1b,
the control unit 30b determines that there is a possibility of a
malfunction of the determination unit or gas leakage in the
multi-stage compressor system 1b using a corrected gas flow rate on
the basis of a measurement value of a pressure or a temperature in
addition to the control unit 30a in the multi-stage compressor
system 1a.
Thereby, the control unit 30b can make a more accurate
determination.
Also, when the pressure and temperature are measured as in the
above-described example, it is desirable to measure a pressure
upstream and measure a temperature downstream. This is because the
turbulence of a gas flow due to the temperature measurement
instrument is likely to affect measurement of the pressure when the
temperature measurement instrument is located upstream and a
pressure is measured downstream.
Also, although a flow rate is corrected on the basis of results of
measuring a pressure and a temperature in the above-described
example, the present invention is not limited thereto. A molecular
weight of a gas may be measured and the flow rate may be corrected
on the basis of the molecular weight. Thereby, it is possible to
perform correction considering an influence by a gas other than the
air and the control unit 30b can make a more accurate
determination.
Fourth Embodiment
FIG. 5 is a diagram showing an example of a configuration of a
multi-stage compressor system 1c according to the fourth embodiment
of the present invention.
The multi-stage compressor system 1c according to the fourth
embodiment includes a multi-stage compressor 10a and a compressor
control device 200c.
The multi-stage compressor system 1c according to the fourth
embodiment is a system in which drain flow rate meters 141 (141a
and 141b) and drain valves 142 (142a and 142b) are added to the
multi-stage compressor system 1a according to the second
embodiment.
Here, a difference of the multi-stage compressor system 1c
according to the fourth embodiment from the multi-stage compressor
system 1a according to the second embodiment will be described.
The drain flow rates during cooling by the coolers 109a and 109b
are measured from the drain flow rate meters 141 (141a and 141b) or
the flow rate is estimated on the basis of degrees of opening of
the drain valves 142 (142a and 142b).
For example, correspondence relationships between drain flow rates
and degrees of opening of the valves are pre-acquired by
experiments and the like and recorded in a storage unit. The drain
flow rate is estimated on the basis of the correspondence
relationships.
The control unit 30c inputs an inlet flow rate determination value
corresponding to the inlet flow rate determination unit 114a from
the flow rate indicator 125a, an inlet flow rate determination
value corresponding to the inlet flow rate determination unit 114b
from the flow rate indicator 125b, and an outlet flow rate
determination value of the outlet flow rate determination unit 115.
The control unit 30c designates the inlet flow rate determination
value input from the flow rate indicator 125a as FI11. The control
unit 30c designates the inlet flow rate determination value input
from the flow rate indicator 125b as FI12. The control unit 30c
designates the output flow rate determination value input from the
outlet flow rate determination unit 115 as FC3. The control unit
30c designates a drain flow rate sum input from the drain flow rate
meter 141 or the drain valve 142 as .SIGMA.FL. The control unit 30c
determines whether an absolute value of (FI11+FI12-FC3-.SIGMA.FL)
is greater than or equal to a predetermined reference value. This
reference value is a value determined in consideration of a flow
rate response delay or a gas leakage amount of a normal operation
time.
The control unit 30c determines that the multi-stage compressor
system 1c is normal when the absolute value of
(FI11+FI12-FC3-.SIGMA.FL) is less than the predetermined reference
value.
Also, when the absolute value of (FI11+FI12-FC3-.SIGMA.FL) is
greater than or equal to the predetermined reference value, the
control unit 30c determines that a malfunction is occurring in the
multi-stage compressor system 1c. In this case, the control unit
30c notifies the user that some malfunction is likely occurring in
the multi-stage compressor system 1c via the notification unit 40.
For example, the notification unit 40 is a display, a speaker, a
vibration device, or the like. The notification unit 40 may display
"Please confirm whether the measuring device is normal." or "Gas is
likely leaking." or provide a notification by sound. Also, the
notification unit 40 may cause the malfunction of the multi-stage
compressor system 1c to be known by vibration.
Also, the control unit 30c may stop flow rate deviation correction
when it is determined that a malfunction is likely occurring in the
multi-stage compressor system 1c. Also, the control unit 30c may
control the blowoff valve 108 to be opened to a fixed degree of
opening in order to prevent a surge operation. In addition, the
control unit 30c may stop the system.
Also, the drain flow rate may be estimated from relationships
between input gas conditions (a temperature, a pressure, a
humidity, etc.) and operation conditions (a temperature and a
pressure).
As described above, in the multi-stage compressor system 1c, the
control unit 30c compares the flow rates of gases taken in by the
first-stage compressor bodies 101a and 101b, which are measured by
the inlet flow rate determination units 114a and 114b (the first
sensor), with the flow rate of a gas discharged by the last-stage
compressor body 102, which is measured by the outlet flow rate
determination unit 115 (the second sensor). When the flow rates of
gases taken in by the first-stage compressor bodies 101, which are
measured by the inlet flow rate determination units 114a and 114b,
are different from the flow rate of a gas discharged by the
last-stage compressor body 102, which is measured by the outlet
flow rate determination unit 115, the control unit 30c determines
that there is a possibility of a malfunction of the determination
unit or gas leakage in the multi-stage compressor system 1c. The
control unit 30c notifies the user of a possibility of some
occurring malfunction in the multi-stage compressor system 1c via
the notification unit 40.
Thereby, the multi-stage compressor system 1c can detect a
malfunction in the multi-stage compressor system 1c without making
the measuring instrument redundant.
Also, when the pressure and temperature are measured as in the
above-described example, it is desirable to measure a pressure
upstream and measure a temperature downstream. This is because the
turbulence of a gas flow due to the temperature measurement
instrument is likely to affect measurement of the pressure when the
temperature measurement instrument is located upstream and a
pressure is measured downstream.
Also, although a flow rate is corrected on the basis of results of
measuring a pressure and a temperature in the above-described
example, the present invention is not limited thereto. A molecular
weight of a gas may be measured and the flow rate may be corrected
on the basis of the molecular weight. Thereby, it is possible to
perform correction considering an influence by a gas other than the
air and the control unit 30c can make a more accurate
determination.
Also, as described above, in the multi-stage compressor system 1c,
the control unit 30c determines that there is a possibility of a
malfunction of the determination unit or gas leakage in the
multi-stage compressor system 1c using a drain flow rate in
addition to the control unit 30a in the multi-stage compressor
system 1a.
Thereby, the control unit 30c can make a more accurate
determination.
Also, although an example shown in the above-described embodiment
is an example in which the gas flow rate of the last-stage
compressor body 102 is measured, the present invention is not
limited thereto. The control unit may compare measurement values in
compressor bodies of arbitrary different stages. In this case, the
possibility of a malfunction of a measuring instrument used in
measurement and the possibility of gas leakage between compressor
bodies of two different stages are determined.
Also, an embodiment of the present invention has been described,
but the above-described multi-stage compressor system 1 internally
includes a computer system. Each process described above may be
stored in a computer-readable recording medium in the form of a
program. The above-described process is performed by the computer
reading and executing the program. Here, the computer-readable
recording medium may be a magnetic disk, a magneto-optical disc, a
compact disc read-only memory (CD-ROM), a digital versatile
disc-read only memory (DVD-ROM), a semiconductor memory, or the
like. In addition, the computer program may be distributed to the
computer through a communication line, and the computer receiving
the distributed program may execute the program.
Also, the above-described program may be a program for implementing
some of the above-described functions. Further, the above-described
program may be a program, i.e., a so-called differential file
(differential program), capable of implementing the above-described
function in combination with a program already recorded on the
computer system.
Although some embodiments of the present invention have been
described, these embodiments have been proposed as examples and are
not intended to limit the range of the invention. These embodiments
can be executed in various other modes. Various omissions,
replacements, and changes can be made in a range not departing from
the scope of the invention.
INDUSTRIAL APPLICABILITY
According to the multi-stage compression system, the control
device, the malfunction determination method, and the program
described above, it is possible to detect a malfunction in a
multi-stage compressor system without making a measuring instrument
redundant.
REFERENCE SIGNS LIST
1, 1a, 1b, 1c Multi-stage compressor system 10, 10a Multi-stage
compressor 20a First sensor 20b Second sensor 30, 30a, 30b, 30c
Control unit 40 Notification unit 50a, 50b Inlet guide vanes (IGV)
opening degree control unit 51 IGV opening degree command value
generation unit 52a, 52b IGV opening degree command value
correction unit 53 Blowoff valve opening degree control unit 54a,
54b Upstream-side anti-surge control unit 55 Outlet pressure
control unit 56 Downstream-side anti-surge control unit 101, 101a,
101b First-stage compressor 102 Last-stage compressor 103
Second-stage compressor 104 Motor 105 Gearbox 106 Shaft 107a, 107b
IGV 108 Blowoff valve 109a, 109b Cooler 110 Post-merger pressure
determination unit 111, 138 Outlet pressure determination unit 112,
113a, 113b Command value selection unit 114a, 114b Inlet flow rate
determination unit 115 Outlet flow rate determination unit 116,
117a, 117b, 118a, 118b, 119, 120, 121a, 121b, 122 Function
generator 123a, 123b Correction cancellation signal generation unit
124 Performance difference correction coefficient generation unit
125a, 125b, 140 Flow rate indicator 126, 136a, 136b, 136c Pressure
indicator 127a, 127b, 128 Flow rate controller 129 Pressure
controller 130a, 130b Supply line 131 Discharge line 132 First
connection line 133 Second connection line 134a, 134b Inlet
pressure determination unit 135a, 135b Inlet temperature
determination unit 136 Blowoff line 137a, 137b, 137c Temperature
indicator 139 Outlet temperature determination unit 141a, 141b
Drain flow rate meter 142a, 142b Drain valve 200a, 200b Compressor
control device
* * * * *